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Is my proposed wiring practical

I'm about to start a wiring project, any advise would be greatly appreciated. Thanks

Four light fixtures between two 3-way switches.
The book suggest this wiring. see attachment.

I suggest these changes numbered 1 through 3.
see 'my version' drawn attachment.

1. I will be adding a dimmer switch.
2. The hot supply wire to the first switch uses one wire only. not cable joined
3. The traveler wires uses 2 wire cable, no splices or wire nuts, travels directly to second switch.
4. The hot supply from to the second switch to the fixture uses one wire only. not cable joined.

I have no idea what you have there but it would not be my way of doing it. Feed one end 3 way switch and take a return cable to the light from the other end. In between run three wire cables to each switch. Pass the neutrals thru.

They say I shot a man named Gray and took his wife to Italy
She inherited a million bucks and when she died it came to me
I can't help it if I'm lucky

I can not read the first attachment because of black on top of black. But I believe it is wrong because of the labeling of some cables as 2 wire.

You must always run all source lines (hots) with their associated return path (usually a neutral, but could be another hot).

Source and return wires when very close to each other produce little external magnetic field. When these wires are separated into a larger loop, then the source line and return line magnetic fields don't do much cancelation of each other.

Between the two three way switches you need a three wire cable, two hots and one return (neutral). Whichever hot wire is energized carrying load current will mostly cancel the magnetic field from the return wire because the three wires are in close proximity to each other.

The load(s) should not be in the return path. Thus, you should consider all three way and any four ways and associated wiring between them as the equivalent of one single SPST switch connected to a load(s).

I'm with Dennis make your cans up bring that wire to your 3way box we will call it load side then take 14 3 from that box to your other 3 way box we will call it your travelers. Then in that box bring in your line side or hot leg .now a dimmer. Switch isn't connected to and existing three way switch like in your drawings dimmer switche will only work on one side. So figure out which. Switch will be used the moste and put the dimmer there